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            <h2 class="toc-title">目录</h2>
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        </div><article class="page single"><h1 class="single-title animated flipInX">《Flutter路由传参向上一级返回数据》</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="/" title="Author" rel=" author" class="author"><i class="fas fa-user-circle fa-fw"></i>早起的年轻人</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/flutter/"><i class="far fa-folder fa-fw"></i>Flutter</a>&nbsp;<a href="/categories/%E8%B7%AF%E7%94%B1%E4%BC%A0%E5%8F%82/"><i class="far fa-folder fa-fw"></i>路由传参</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2021-05-22">2021-05-22</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1013 字&nbsp;
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  <ul>
    <li>
      <ul>
        <li>
          <ul>
            <li><a href="#返回1">返回1</a></li>
            <li><a href="#返回2">返回2</a></li>
            <li><a href="#接受">接受</a></li>
          </ul>
        </li>
      </ul>
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            </div><div class="content" id="content"><p>在项目中经常需要返回特定数据，或者传递参数给上一页</p>
<h3 id="返回1">返回1</h3>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt">1
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<td class="lntd">
<pre class="chroma"><code class="language-dart" data-lang="dart"> <span class="nl">onPressed:</span> <span class="p">()</span> <span class="p">{</span>
            <span class="n">Map</span> <span class="n">infos</span> <span class="o">=</span> <span class="p">{};</span>
            <span class="n">infos</span><span class="p">[</span><span class="s2">&#34;nickname&#34;</span><span class="p">]</span> <span class="o">=</span> <span class="n">nicknamelast</span><span class="p">;</span>
            <span class="n">infos</span><span class="p">[</span><span class="s2">&#34;avatar&#34;</span><span class="p">]</span> <span class="o">=</span> <span class="n">avatar</span><span class="p">;</span>
            <span class="n">Navigator</span><span class="p">.</span><span class="n">of</span><span class="p">(</span><span class="n">context</span><span class="p">).</span><span class="n">pop</span><span class="p">(</span><span class="n">infos</span><span class="p">);</span>
          <span class="p">}</span>
</code></pre></td></tr></table>
</div>
</div><h3 id="返回2">返回2</h3>
<p><strong>Flutter中可以通过WillPopScope来实现返回按钮拦截</strong></p>
<p><strong>onWillPop是一个WillPopScope的回调函数，当用户点击返回按钮时被调用</strong></p>
<p><strong>WillPopScope必须包含child，否则会报错</strong></p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-dart" data-lang="dart"> <span class="n">WillPopScope</span><span class="p">(</span>
 
<span class="nl">child:</span><span class="p">...,</span>


<span class="nl">onWillPop:</span> <span class="p">()</span> <span class="p">{</span>
        <span class="n">Map</span> <span class="n">infos</span> <span class="o">=</span> <span class="p">{};</span>
        <span class="n">infos</span><span class="p">[</span><span class="s2">&#34;nickname&#34;</span><span class="p">]</span> <span class="o">=</span> <span class="n">nicknamelast</span><span class="p">;</span>
        <span class="n">infos</span><span class="p">[</span><span class="s2">&#34;avatar&#34;</span><span class="p">]</span> <span class="o">=</span> <span class="n">avatar</span><span class="p">;</span>
        <span class="n">Navigator</span><span class="p">.</span><span class="n">of</span><span class="p">(</span><span class="n">context</span><span class="p">).</span><span class="n">pop</span><span class="p">(</span><span class="n">infos</span><span class="p">);</span>
      <span class="p">},</span>
      
</code></pre></td></tr></table>
</div>
</div><p>源码：</p>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre class="chroma"><code class="language-dart" data-lang="dart"><span class="c1">// Copyright 2014 The Flutter Authors. All rights reserved.
</span><span class="c1">// Use of this source code is governed by a BSD-style license that can be
</span><span class="c1">// found in the LICENSE file.
</span><span class="c1"></span>
<span class="c1">// @dart = 2.8
</span><span class="c1"></span>
<span class="k">import</span> <span class="s1">&#39;framework.dart&#39;</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">&#39;navigator.dart&#39;</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">&#39;routes.dart&#39;</span><span class="p">;</span>

<span class="c1">///为用户否决尝试注册一个回调，以取消封闭
</span><span class="c1">///[ModalRoute]。
</span><span class="c1">///
</span><span class="c1">///也可以看看：
</span><span class="c1">///
</span><span class="c1">///*[ModalRoute.addScopedWillPopCallback]和[ModalRoute.removeScopedWillPopCallback]，
</span><span class="c1">///此小部件用来注册和注销[onWillPop]的代码。 
</span><span class="c1"></span><span class="kd">class</span> <span class="nc">WillPopScope</span> <span class="kd">extends</span> <span class="n">StatefulWidget</span> <span class="p">{</span>
  <span class="c1">///创建一个小部件，该小部件注册用户对否决尝试的回调
</span><span class="c1"></span>  <span class="c1">///关闭封闭的[ModalRoute]。
</span><span class="c1"></span>  <span class="c1">///
</span><span class="c1"></span>  <span class="c1">///[child]参数不能为null。 
</span><span class="c1"></span>  <span class="kd">const</span> <span class="n">WillPopScope</span><span class="p">({</span>
    <span class="n">Key</span> <span class="n">key</span><span class="p">,</span>
    <span class="err">@</span><span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">child</span><span class="p">,</span>
    <span class="err">@</span><span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">,</span>
  <span class="p">})</span>  <span class="o">:</span> <span class="k">assert</span><span class="p">(</span><span class="n">child</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">),</span>
        <span class="k">super</span><span class="p">(</span><span class="nl">key:</span> <span class="n">key</span><span class="p">);</span>

  <span class="c1">/// The widget below this widget in the tree.
</span><span class="c1"></span>  <span class="c1">///
</span><span class="c1"></span>  <span class="c1">/// {@macro flutter.widgets.child}
</span><span class="c1"></span>  <span class="kd">final</span> <span class="n">Widget</span> <span class="n">child</span><span class="p">;</span>

  <span class="c1">///由用户调用否决尝试以消除封闭的[ModalRoute]。
</span><span class="c1"></span>   <span class="c1">///
</span><span class="c1"></span>   <span class="c1">///如果回调返回的Future解析为false，则包含
</span><span class="c1"></span>   <span class="c1">///不会弹出路线。
</span><span class="c1"></span>  <span class="kd">final</span> <span class="n">WillPopCallback</span> <span class="n">onWillPop</span><span class="p">;</span>

  <span class="err">@</span><span class="n">override</span>
  <span class="n">_WillPopScopeState</span> <span class="n">createState</span><span class="p">()</span> <span class="o">=&gt;</span> <span class="n">_WillPopScopeState</span><span class="p">();</span>
<span class="p">}</span>

<span class="kd">class</span> <span class="nc">_WillPopScopeState</span> <span class="kd">extends</span> <span class="n">State</span><span class="o">&lt;</span><span class="n">WillPopScope</span><span class="o">&gt;</span> <span class="p">{</span>
  <span class="n">ModalRoute</span><span class="o">&lt;</span><span class="kt">dynamic</span><span class="o">&gt;</span> <span class="n">_route</span><span class="p">;</span>

  <span class="err">@</span><span class="n">override</span>
  <span class="kt">void</span> <span class="n">didChangeDependencies</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">super</span><span class="p">.</span><span class="n">didChangeDependencies</span><span class="p">();</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span>
      <span class="n">_route</span><span class="o">?</span><span class="p">.</span><span class="n">removeScopedWillPopCallback</span><span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">);</span>
    <span class="n">_route</span> <span class="o">=</span> <span class="n">ModalRoute</span><span class="p">.</span><span class="n">of</span><span class="p">(</span><span class="n">context</span><span class="p">);</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span>
      <span class="n">_route</span><span class="o">?</span><span class="p">.</span><span class="n">addScopedWillPopCallback</span><span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">);</span>
  <span class="p">}</span>

  <span class="err">@</span><span class="n">override</span>
  <span class="kt">void</span> <span class="n">didUpdateWidget</span><span class="p">(</span><span class="n">WillPopScope</span> <span class="n">oldWidget</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">super</span><span class="p">.</span><span class="n">didUpdateWidget</span><span class="p">(</span><span class="n">oldWidget</span><span class="p">);</span>
    <span class="k">assert</span><span class="p">(</span><span class="n">_route</span> <span class="o">==</span> <span class="n">ModalRoute</span><span class="p">.</span><span class="n">of</span><span class="p">(</span><span class="n">context</span><span class="p">));</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="n">oldWidget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">&amp;&amp;</span> <span class="n">_route</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span> <span class="p">{</span>
      <span class="k">if</span> <span class="p">(</span><span class="n">oldWidget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span>
        <span class="n">_route</span><span class="p">.</span><span class="n">removeScopedWillPopCallback</span><span class="p">(</span><span class="n">oldWidget</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">);</span>
      <span class="k">if</span> <span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span>
        <span class="n">_route</span><span class="p">.</span><span class="n">addScopedWillPopCallback</span><span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">);</span>
    <span class="p">}</span>
  <span class="p">}</span>

  <span class="err">@</span><span class="n">override</span>
  <span class="kt">void</span> <span class="n">dispose</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span> <span class="o">!=</span> <span class="kc">null</span><span class="p">)</span>
      <span class="n">_route</span><span class="o">?</span><span class="p">.</span><span class="n">removeScopedWillPopCallback</span><span class="p">(</span><span class="n">widget</span><span class="p">.</span><span class="n">onWillPop</span><span class="p">);</span>
    <span class="k">super</span><span class="p">.</span><span class="n">dispose</span><span class="p">();</span>
  <span class="p">}</span>

  <span class="err">@</span><span class="n">override</span>
  <span class="n">Widget</span> <span class="n">build</span><span class="p">(</span><span class="n">BuildContext</span> <span class="n">context</span><span class="p">)</span> <span class="o">=&gt;</span> <span class="n">widget</span><span class="p">.</span><span class="n">child</span><span class="p">;</span>
<span class="p">}</span>

</code></pre></td></tr></table>
</div>
</div><h3 id="接受">接受</h3>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre class="chroma"><code class="language-dart" data-lang="dart"> <span class="nl">onPressed:</span> <span class="p">()</span> <span class="p">{</span>
                        <span class="n">Navigator</span><span class="p">.</span><span class="n">pushNamed</span><span class="p">(</span><span class="n">context</span><span class="p">,</span> <span class="n">route</span><span class="p">.</span><span class="n">OpenPersonInfoPage</span><span class="p">)</span>
                            <span class="p">.</span><span class="n">then</span><span class="p">((</span><span class="n">value</span><span class="p">)</span> <span class="p">{</span>
                          <span class="n">setState</span><span class="p">(()</span> <span class="p">{</span>
                            <span class="n">print</span><span class="p">(</span><span class="n">value</span><span class="p">.</span><span class="n">toString</span><span class="p">());</span>

                            <span class="n">Map</span> <span class="n">agrs</span> <span class="o">=</span> <span class="n">value</span><span class="p">;</span>
                            <span class="n">Config</span><span class="p">.</span><span class="n">UInfo</span><span class="p">.</span><span class="n">nickname</span> <span class="o">=</span> <span class="n">agrs</span><span class="p">[</span><span class="s2">&#34;nickname&#34;</span><span class="p">];</span>
                            <span class="n">Config</span><span class="p">.</span><span class="n">UInfo</span><span class="p">.</span><span class="n">avatar</span> <span class="o">=</span> <span class="n">agrs</span><span class="p">[</span><span class="s2">&#34;avatar&#34;</span><span class="p">];</span>
                          <span class="p">});</span>
</code></pre></td></tr></table>
</div>
</div><p>这样的话，就可以在按返回按钮的时候返回数据，</p>
<p>在这儿还可以向大家介绍如何双击退出程序</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
<pre class="chroma"><code><span class="lnt"> 1
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<td class="lntd">
<pre class="chroma"><code class="language-dart" data-lang="dart"><span class="k">import</span> <span class="s1">&#39;package:flutter/cupertino.dart&#39;</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">&#39;package:flutter/material.dart&#39;</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">&#39;package:fluttertoast/fluttertoast.dart&#39;</span><span class="p">;</span>
 
<span class="kt">void</span> <span class="n">main</span><span class="p">()</span> <span class="p">{</span>
  <span class="n">runApp</span><span class="p">(</span><span class="n">MyApp</span><span class="p">());</span>
<span class="p">}</span>
 
<span class="kd">class</span> <span class="nc">MyApp</span> <span class="kd">extends</span> <span class="n">StatefulWidget</span> <span class="p">{</span>
  <span class="err">@</span><span class="n">override</span>
  <span class="n">State</span><span class="o">&lt;</span><span class="n">StatefulWidget</span><span class="o">&gt;</span> <span class="n">createState</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">return</span> <span class="n">WillPopTest</span><span class="p">();</span>
  <span class="p">}</span>
<span class="p">}</span>
 
<span class="kd">class</span> <span class="nc">WillPopTest</span> <span class="kd">extends</span> <span class="n">State</span> <span class="p">{</span>
  <span class="n">DateTime</span> <span class="n">_lastTime</span><span class="p">;</span>
  <span class="err">@</span><span class="n">override</span>
  <span class="n">Widget</span> <span class="n">build</span><span class="p">(</span><span class="n">BuildContext</span> <span class="n">context</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">return</span> <span class="n">MaterialApp</span><span class="p">(</span>
      <span class="nl">home:</span> <span class="n">Scaffold</span><span class="p">(</span>
        <span class="nl">appBar:</span> <span class="n">AppBar</span><span class="p">(</span>
          <span class="nl">backgroundColor:</span> <span class="n">Colors</span><span class="p">.</span><span class="n">blue</span><span class="p">,</span>
          <span class="nl">centerTitle:</span> <span class="kc">true</span><span class="p">,</span>
          <span class="nl">title:</span> <span class="n">Text</span><span class="p">(</span>
            <span class="s1">&#39;实现二次点击退出&#39;</span><span class="p">,</span>
            <span class="nl">style:</span> <span class="n">TextStyle</span><span class="p">(</span><span class="nl">fontSize:</span> <span class="m">18</span><span class="p">,</span> <span class="nl">color:</span> <span class="n">Colors</span><span class="p">.</span><span class="n">white</span><span class="p">),</span>
          <span class="p">),</span>
        <span class="p">),</span>
        <span class="nl">body:</span> <span class="n">WillPopScope</span><span class="p">(</span>
          <span class="nl">onWillPop:</span> <span class="p">()</span><span class="kd">async</span><span class="p">{</span>
            <span class="k">if</span><span class="p">(</span><span class="n">_lastTime</span><span class="o">==</span><span class="kc">null</span><span class="o">||</span><span class="n">DateTime</span><span class="p">.</span><span class="n">now</span><span class="p">().</span><span class="n">difference</span><span class="p">(</span><span class="n">_lastTime</span><span class="p">)</span><span class="o">&gt;</span><span class="n">Duration</span><span class="p">(</span><span class="nl">seconds:</span> <span class="m">1</span><span class="p">)){</span>
              <span class="n">_lastTime</span><span class="o">=</span><span class="n">DateTime</span><span class="p">.</span><span class="n">now</span><span class="p">();</span>
              <span class="n">Fluttertoast</span><span class="p">.</span><span class="n">showToast</span><span class="p">(</span><span class="nl">msg:</span> <span class="s2">&#34;再点击一次退出app&#34;</span><span class="p">,</span>
                <span class="nl">fontSize:</span> <span class="m">16</span><span class="p">,</span>
                <span class="nl">backgroundColor:</span> <span class="n">Colors</span><span class="p">.</span><span class="n">blue</span><span class="p">,</span>
                <span class="nl">textColor:</span> <span class="n">Colors</span><span class="p">.</span><span class="n">white</span>
              <span class="p">);</span>
              <span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
            <span class="p">}</span>
            <span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
          <span class="p">},</span>
          <span class="nl">child:</span> <span class="n">Container</span><span class="p">(</span>
            <span class="nl">alignment:</span> <span class="n">Alignment</span><span class="p">.</span><span class="n">center</span><span class="p">,</span>
            <span class="nl">child:</span> <span class="n">Text</span><span class="p">(</span>
              <span class="s2">&#34;1秒内连续按两次返回键退出&#34;</span><span class="p">,</span>
              <span class="nl">style:</span> <span class="n">TextStyle</span><span class="p">(</span><span class="nl">fontSize:</span> <span class="m">30</span><span class="p">),</span>
            <span class="p">),</span>
          <span class="p">),</span>
        <span class="p">),</span>
      <span class="p">),</span>
    <span class="p">);</span>
  <span class="p">}</span>
<span class="p">}</span>



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